---
title: "Dropbox security incident"
description: "What the retained public evidence establishes about the Dropbox incident, its attack path, impact, and response."
incident_type: "Cybersecurity incident"
status: "active"
last_modified: "2026-09-19"
canonical_url: "https://www.ally.security/incidents/dropbox-security-incident-2022"
markdown_url: "https://www.ally.security/incidents/dropbox-security-incident-2022.md"
stix_url: "https://www.ally.security/incidents/dropbox-security-incident-2022/stix.json"
---

# Dropbox security incident

The retained public source describes the Dropbox incident as Phishing of an employee impersonating CircleCI; GitHub access token stolen. Other material details remain unresolved.

Last modified Sep 19, 2026 · 1 source

## Summary

- **Environment:** Cloud storage/Tech
- **Operational impact:** The reviewed source does not establish a precise operational or data impact
- **Financial impact:** No financial figure is established by the reviewed source evidence

## What happened

In 2022, Dropbox experienced an incident in its cloud storage/tech environment. The retained source describes the attack path as follows: Phishing of an employee impersonating CircleCI; GitHub access token stolen. [1](#source-1)

## Impact

- The reviewed source does not establish a precise affected-person count, data scope, or operational consequence.
- No financial loss, ransom amount, recovery cost, or regulatory penalty is established by the reviewed source evidence.

## Threat Group & Attack Vector

The retained source describes the attack path as follows: Phishing of an employee impersonating CircleCI; GitHub access token stolen. The canonical record does not add intrusion steps beyond those supported by the source. [1](#source-1)

### Actors

- No threat actor group has been identified in the reviewed public evidence.

### TTPs

- [T1566 — Phishing](https://attack.mitre.org/techniques/T1566/) — mapped from the cited behavior. [1](#source-1)
- [T1528 — Steal Application Access Token](https://attack.mitre.org/techniques/T1528/) — mapped from the cited behavior. [1](#source-1)

## Response

The retained source describes containment action intended to limit further access or disruption. [1](#source-1)

This account is bounded to [A recent security incident involving Dropbox Sign](https://sign.dropbox.com/blog/a-recent-security-incident-involving-dropbox-sign). Details absent from that evidence are left unresolved rather than inferred. [1](#source-1)

## Assets

[Download the case-scoped STIX 2.1 bundle](<https://www.ally.security/incidents/dropbox-security-incident-2022/stix.json>)

## Sources

Primary source records used to research this incident.

<a id="source-1"></a>

### A recent security incident involving Dropbox Sign

official · Dropbox

<https://sign.dropbox.com/blog/a-recent-security-incident-involving-dropbox-sign>

<details>
<summary>Evidence ledger</summary>

Review the supporting structured claims.

1. **Resulted In · 90% confidence · current**  
   Dropbox security incident: The retained source describes containment action intended to limit further access or disruption.
2. **Used Attack Technique · 90% confidence · current**  
   Dropbox security incident: https://attack.mitre.org/techniques/T1566/
3. **Resulted In · 100% confidence · current**  
   Dropbox security incident: The reviewed source documents the dropbox security incident involving Dropbox.
4. **Used Attack Technique · 90% confidence · current**  
   Dropbox security incident: https://attack.mitre.org/techniques/T1528/
5. **Affected Organization · 100% confidence · current**  
   Dropbox security incident: Dropbox
6. **Resulted In · 84% confidence · current**  
   Dropbox security incident: Phishing of an employee impersonating CircleCI; GitHub access token stolen.

</details>